Author: Jun Pataleta
MDL-54976 mod_scorm: Add validation for availability dates
http://git.moodle.org/gw?p=moodle.git;a=commit;h=184a6e1647eba672bd41f39332d3373163e2b885
http://github.com/moodle/moodle/commit/184a6e1647eba672bd41f39332d3373163e2b885
+ 3.1 en [closebeforeopen,mod_scorm]